| Amplification | Plasma liquid | Dried Plasma Spot (DPS) | ||
| Protease | TR | Protease | TR | |
| Positive | 44 (88%) | 48 (96%) | 40 (80%) | 45 (90%) |
| Negative | 6 (12%) | 2 (4%) | 10 (20%) | 5 (10%) |